add comment what compress-music.sh does

compress-music.sh

@@ -1,6 +1,10 @@
 #!/bin/bash
 set -e
 
+#
+# this script compresses everything in $source and saves it in $destination
+#
+
 source="$HOME/kskcloud/Musik/"
 tmp="$HOME/Musik.tiny/"
 destination="$HOME/kskcloud/Musik.tiny/"
@@ -31,4 +35,4 @@ find "$tmp" -type f -not -name '*.opus' -delete
 # copy compressed files to target destination
 cp -a --reflink=always "$tmp/"* "$destination"
 
-rm -r "$tmp"
+rm -r "$tmp"